Rubber sandal



ug- 14, 1956 sEllcHs MIYAJI 2,758,395

RUBBER SANDAL Filed Aug. 13, 1953 United States Patent Ot'ce .Patented Aug. 14, 1956 RUBBER 'SANDAL Seiichi Miyaji, Fukuyama, Hiroshima-ken, Japan Application August 13, 1953, Serial No. 374,051

1 Claim. (Cl. 36-115) This invention relates to an article of footwear, and more particularly, to a rubber sandal having a novel construction including rubber straps formed integral with the rubber sole.

ln the prior art, sandals having straps for securing the sole to the foot of the wearer are well known. However, these prior art sandals have several defects or disadvantages. More specifically, the straps frequently tend to break at the connecting points thereof to the sole, and are relatively expensive as to the replacement thereof.

According to this invention, a rubber sandal comprises a rubber sole having an upper surface upon which the foot of the wearer may rest and a lower surface adapted to contact with the ground and also rubber straps characterized by the fact that the rubber sole has the rubber straps formed integral with the sole by the vulcanization of the rubber after the initial formation of the sandal cords, such as cotton threads or tire cords, are embedded previously as cores in all the straps and a portion of the sole when the sandal is rst formed in a casting mould so that the connections between the straps and the sole are considerably increased in strength and durability.

It is, therefore, an object of the present invention to provide a novel form of a rubber sandal which has rubber straps formed integral with a rubber sole by a simple vulcanizing operation after the formation of the sandal embedded with strong cores in the casting mould has been nished, thus, the cost of manufacture is decreased considerably and the strength of the straps is increased very much in comparison with a usual sandal in which it is necessary frequently to replace the straps in use of the sandal.

The invention will now be described with reference to the accompanying drawings wherein:

Fig. l is a top plan view of a rubber sandal constructed in accordance with the present invention.

Fig. 2 is a bottom plan view showing the lower surface of the sole.

Fig. 3 is a vertical sectional view taken substantially on the line 3-3 of Fig. l.

Fig. 4 is a vertical sectional View taken substantially on the line 4 4 of Fig. 1.

Referring to the drawings, the reference numeral 11 indicates generally the rubber sole of the rubber sandal. The upper surface 12 of the sole 11 is preferably provided with a series of longitudinal slits 13 crossed by transverse slits 14 which are spaced relatively closer than, and are somewhat shallower than, the longitudinal slits 13 as usual. The sole has the straps, generally indicated as 15, comprising two side strap sections 16, 17 and a fore strap section 1S which are formed integral with the sole 11 by the vulcanization of the rubber after the formation of the sandal in the casting mould (not shown).

According to the present invention, strong cords 19, such as cotton threads or tire cords, are embedded as reinforcing cores in the two side strap sections 16, 17 and the fore strap section 18; the cords 19 extend into a portion of the sole 11 as clearly shown in Fig. 3 when the sandal is formed in the form of a required size in the casting mould not shown before the vulcanizing operation is started.

In order to insure the adhesion of the rubber sole 11 and the straps 15 to the cords 19, the cords are preferably coated or saturated suiciently with a gummy paste. Also, the vulcanizing operation is preferably effected at a lower temperature to increase the durability of the sandal to be produced.

As above described, in accordance with this invention, as the straps and their connections with the sole have the strong cords embedded therein before the vulcanization thereof, it is apparent that the construction of the present rubber sandal has a great strength and durability in use and consequently the present rubber sandal as a whole may be used over a long period without any trouble.

What I claim is:

A rubber sandal comprising a rubber sole having an upper surface upon which the foot of the wearer may rest and a lower surface adapted to contact with the ground and also having rubber straps, said sandal being characterized by the fact that the rubber sole has the rubber straps formed integral with the sole; the said straps having reinforcing rough-surfaced cords imbedded therein as cores; the said cords extending into a portion of the sole so that the connections between the straps and the sole are considerably increased in strength and durability, said straps comprising a pair of side straps meeting forwardly of said sandal and a fore strap integrally joined to said side straps at the point of meeting thereof, said fore strap having an end integral with the sole, said cords extending continuously through said side straps from the rear ends thereof and being imbedded thereat in said sole and extending a substantial distance in said sole in a plane substantially parallel with the surfaces of said sole, and said cords passing through the joining point of said side straps and said fore strap and extending downwardly through said fore strap into said sole and having ends extending forwardly and rearwardly within said sole substantially parallel to the surfaces thereof and for a substantial distance therein.

References Cited in the file of this patent UNITED STATES PATENTS 891,384 Strang June 23, 1908 1,342,677 Horstman June 8, 1920 1,419,676 Koch June 13, 1922 1,543,160 Hottel .lune 23, 1925 1,622,860 Cutler Mar. 29, 1927 1,701,773 Ferrettie Feb. l2, 1929 1,875,162 Sayers Aug. 30, 1932 1,894,610 Joy Jan. 17, 1933 2,595,643 Daugherty May 6, 1952 FOREIGN PATENTS 419-871 Great Britain Nov. 20, 1934 

